I’ve been skipping my period (taking it after every three packs) for years now. I have a experienced a bit of breakthrough bleeding in the past but it’s always just spotting and I usually just tough it out until my next break and then it goes away. This time, I’m only through my first pack and I am having fairly heavy bleeding and bad cramping, just like when I get my actual withdraw period. I’m a bit concerned as this has never happened before but how do I stop it if I’m in the middle of my second pack?

Nothing to be concerned about, you could try having a break week now to see if it helps but it doesn’t guarantee the bleeding will stop. Breakthrough bleeding can come in different flows and accompanied by cramps; both are just normal side effects.